Changing the inheritance example from March 17th: is now an abstract class. Everything else works as before.

import java.awt.*;

public abstract class Picture {
    protected int x;
    protected int y;
    protected int w;
    protected int h;
    protected Color c;

    public Picture (int x, int y, int w, int h, Color c) {
	this.x = x;
	this.y = y;
	this.w = w;
	this.h = h;
	this.c = c;

    // method draw will be overwritten in subclasses:
    public abstract void draw(Graphics g); 

    public boolean isGreen() {
	System.out.println("is Green called");
	return c ==;

This is an example from CSci 1211 course.

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